Segue na íntegra a matéria da revista "Muscle Development" de abril de 2009.
ZMA Has No Effect On Testosterone
Many bodybuilders take ZMA
because they believe it increases
testosterone levels and might be a
‘drug-free’ method of boosting muscle
growth. ZMA contains zinc, vitamin B-
6 and magnesium. Zinc is involved in
testosterone metabolism. In the 1960s,
scientists found that men with low
levels of zinc also had low testos-
terone levels. In 2000, Brill and Conti
found that ZMA increased testos-
terone levels by 30 percent in athletes.
This study made ZMA an overnight
sensation. Subsequent studies showed
that zinc supplements did not increase
testosterone levels in people with nor-
mal blood levels of zinc. A study con-
ducted at the German Research
Center of Elite Sport in Cologne,
Germany found that ZMA supple-
ments had no effect on blood levels of
total testosterone or the biologically
active free testosterone. Subjects took
three ZMA capsules per day (30
mg of zinc per dose) for 58
days. While the supplements
increased blood zinc levels,
they had no effect on testos-
terone. (European Journal of
Clinical Nutrition, 63: 65-70,
2009
A parte importante é: " While the supplements
increased blood zinc levels,
they had no effect on testos-
terone." (Enquanto os suplementos aumentaram o nivel de zinco no sangue, não houve mudanças no nivel de testosterona.)
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